To transfer messages and other items from a Windows-based computer to a Mac, Outlook for Mac can import Outlook Data Files (.pst) that were created in Outlook for Windows.
Transfer a .pst file from Windows to Mac
On the Outlook for Mac File menu, select Import…
Choose Outlook for Windows archive file (.pst), and then choose Continue.
Locate the data file on your computer, and then choose Import.
When the import process is complete, choose Finish.
The imported items appear in the navigation pane under On My Computer.
Important: Office 2011 is no longer supported.